<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>下拉菜单</title>
<link rel="stylesheet" href="css/bootstrap.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>





  <script src="js/jquery.min.js"></script>
  <script src="js/bootstrap.min.js"></script> 
</body>
</html>